Can't get unlimited on ios

I want to subscribe unlimited, but the app showed me "request failed". The screenshot is posted. I have tried several times, and the problem is still there. Can anybody help me please?
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@banboo It's probably because Lingvist is not available in China now.

Similar issue in the US. Apple charged for a subscription but the application does not see it. Please help!

Same here, I tried both Chinese store and the US store, none of them worked.

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